The Effects of the Operational Sex Ratio on Female and Male Mate Choice in the Jamaican Field Cricket (Gryllus assimillis)

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Villarreal, Amy




The operational sex ratio (OSR; ratio of sexually available females to sexually available males) is a social environment that greatly influences mate choice, but how it concurrently affects mate choice in both sexes in species with mutual mate choice remains poorly understood. In this thesis, I experimentally investigated the potential influence of variation in the local OSR (male-biased, even sex ratio, and female-biased) on which sex is the choosiest in the Jamaican field cricket, Gryllus assimilis. I also tested the consistency of individual mate choice as quantified using a dichotomous mate choice test and a full-interaction choice test under different OSR levels. OSR did not influence female or male choice of the field crickets, but did influence how potential mates interact. There was no significant consistency between the two types of mate choice tests used, and the OSR did not affect the likelihood of crickets consistently choosing the same mate.






Carleton University

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Theses and Dissertations

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